Apparatus for venting cores.



PATENTED JULY 14, 1908.

W. E. CLIFFORD. I APPARATUS FOR VENTING OORES.

APPLICATION FILED JAN.15.1908

W 60 W 7) on zm s UNITED STATES PATENT OFFICE. WALTER E. CLIFFORD, OFHOPEDALE, MASSACHUSIFFTS, ASSIGNOR TO DRAPER COMPANY,

OF HOPEDALE, MASSACHUSETTS, A CORPORATIONCF MAINE. I

APPARATUS FOR VENTING CORES.

Specification of Letters Patent. 7

Application filed January 15, 1908. Serial No. 410,898.

To all whom it may concern:

Be it known that I, VVALTER E. CLIFFORD, a citizen of the United States,and resident of Hopedale, county of WVorcester, State of Massachusetts,have invented an Improvement in Apparatus for Venting Cores, of whichthe following description, in connection with the accompanying drawing,is a specification, like letters on the drawing representing like parts.

This invention has for its object the production of apparatus forreadily and quickly venting a gang or group of cores used in metalfounding.

WVhere a large number of cores of a similar character are used they areformed in a corebox containing a large number of molds in which thecores are formed, and it is necessary to vent the cores so that thegases generated by the molten metal may escape without injury to themold or the casting.

The venting of the core is usually performed by thrusting into it a thinrod or pin, and the present invention provides a simple apparatuswhereby a gang or group of cores may be vented simultaneously, whilethey are in the core-box. This mode of procedure facilitates thecore-making o eration and is attended with no liability o' damaging thecore.

Figure 1 is a front elevation of a core-venting apparatus embodying oneform of the present invention; Fig. 2 is a top plan view thereof.

In the present embodiment of the invention a flat, rectangular andpreferablymetallic plate 1 constitutes a base, Fig. 1, having a seriesof apertures 2, see dotted lines Fig. 1, formed therein, one for each ofthe venting pins 3. These venting pins are long, slight metal rods ofsuitable diameter to form the vents, and each one at its lower endloosely enters one of the holes 2 in the base, the upper ends of thepins being fixedly held in a carrier.

The carrier is shown in Fig. 2 as a rectangular frame 4 having a seriesof parallel longitudinal bars 5, strengthened by cross-bars orconnections 6', the upper ends of the pins 3 being securely fixed in thebars, the number and relative position of the pins being determined bythe number and position of the core molds in the core-box. Handles 7 areattached to the top of the carrier, at its op- Patented July 14, 1908.

the base 1 at the center thereof and is 'extended upward through acenter hole in the crossed portions of two frames 9, 10, preferably madeof strap metal and riveted to the carrier, the frames projecting somedistance above the carrier as shown in Fig. 1.

Check-nuts 11 are screwed onto the upper end of the guide-rod, above thecrossing of the frames, and a spiral spring 12 is coiled around theguide-rod between the base and the top of the frames, said springnormally holding the carrier and base separated, as in full linesFig. 1. The check-nuts are adjusted so that the lower ends of theventing pins 3 will be housed within the base when the spring isexpanded, the frames 9 and 10 serving to stiffen the guide-rod and thelatter, with the pins 3, prevent any lateral displacement of the baseand carrier.

In using the apparatus the base is set on top of the core-box with thegang of pins 3 over the upper ends of the cores therein, and theoperator then grasps the handles 7 and presses the carrier steadilydownward, the venting pins depending therefrom sliding through the baseand into the cores, to form the vents therein. The dotted lines in Fig.1 show the ins projected below the base, the correspon ing position ofthe carrier being also shown in dotted lines. I

In order to positively limit the operative movement toward the baseadjustable stops are provided, shown as threaded rods 13 passed throughthreaded holes in the frame 4 of the carrier, preferably diagonallyopposite each other, each stop having a check-nut 14 and a milled orother head 15. The stops are set at such a distance from the base as itis desired the venting pins shall enter the cores, so that when the pinshave been pro j ected the requisite distance the ends of the stop willengage the base and prevent further operative movement of the carrier.When the cores have been vented the carrier is re-' leased and it iselevated by expansion of the spring 12, thereby returning the apparatusto normal position, the ascent of the carrier retracting the ventingpins from the cores.

It will be manifest that the movement of.

the pins is direct and accurate, it is regulated positively, by themeans described, and said pins are Withdrawn smoothly and without ateralmovement, the apparatus enabling a I loosely extended through thecarrier, a spring normally separating the base and carrier, and means tolimit the spring-induced separation of said parts and prevent withdrawalof the free ends of the pins from the base, downward pressure on thecarrier compressing the spring and projecting the lower ends of the pinsbeyond the base and into a group of cores, to form vents therein.

2. In a core-venting apparatus, an apertured base, a carrier having agang of depending venting pins longitudinally movable through theapertures in the base, separate means to guide the movement of thecarrier toward the base, to project the pins beyond the base and intothe cores, means to yieldingly separate said base and carrier, and adjustable means to positively limit the operativemovement of the carrierto project the venting pins' 3'. In a core-venting apparatus, anapertured base adapted to rest upon the to of a corebox, a carriermovable toward anc from the base and having an attached group of ventingpins extended slidably through the base, to pass into and form vents inthe cores in a core-box, a spring interposed between the base andcarrier, to lift the latter and retract the pins from the cores, meansto limit the separation of the base and carrier, and adjustable stops onone of said parts to en gage the other part and thereby limit movementof the carrier to project the pins into the cores.

4. In a core-venting apparatus, a base adapted to rest upon the top of acore box, a

' yieldingly-sustained carrier movable toward and from the base, aplurality of venting pins rigidly attached to the carrier and movablelongitudinally through the base, to pass into the cores, when thecarrier is depressed,

means to limit movement of the carrier to retract the pins, and means todetermine the extent to which the pins shall be projected beyond thebase by operative movement of the carrier.

5. In a core-venting apparatus, a base adapted to rest upon the top of acore-box, a yieldingly-sustained carrier movable toward and from thebase, a plurality of venting pins rigidly attached to the carrier andmovable longitudinally through the base, to pass into the cores, whenthe carrier is depressed, means to limit movement of the carrier to retract the pins, threaded -stops extended through the carrier, to engagethe base and thereby limit the extent to which the pins shall beprojected by operative movement of the carrier, and check-nuts to lockthestops when adjusted.

6. In a core-venting apparatus, a base adapted to rest upon the top of amultiple core-box, a carrier movable toward and from the base, a gang ofventing pins mounted on the carrier and longitudinally movable throughthe base, to enter the cores and vent the same simultaneously when thecarrier is depressed, and adjustable means to limit the movement of thecarrier toward the base, to thereby limit the penetrative movement ofthe venting pins.

In testimony whereof, I have signed my name to this specification, inthepresence of two subscribing witnesses.

WALTER E. CLIFFORD.

Witnesses:

ALEXANDER P. DAVIS, EDWARD DANA Oseoon.

